/Engine/Source/Runtime/Engine/Public/EditorSupportDelegates.h
Delegate type for numeric parameter default change event
typedef TMulticastDelegate_FourParams< void, class [UMaterialExpression](API\Runtime\Engine\Materials\UMaterialExpression) *, EMaterialParameterType, [FName](API\Runtime\Core\UObject\FName), const [UE::Shader::FValue](API\Runtime\Engine\Shader\FValue) & > FOnNumericParameterDefaultChanged